railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Algebra Identities

यदि (a + b + c) = 16, और (a2 + b2 + c2) = 90 है, तो (ab + bc + ca) का मान ज्ञात कीजिए।

1
84
2
83
3
82
4
81
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